96 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 
Rhode Island (C. W. Johnson); New York, New York; Bloomington, 
Indiana (F. Payne); Plummer’s Island, Maryland (R. C. Shannon); 
District of Columbia (Loew collection); Dead Run, Virginia (R. C. Shan- 
non); North Carolina (U. S. Nat. Mus. coll.); Macon, Georgia (G. L. 
Carver): Kushla, Alabama; Helena, Arkansas (H. 8. Barber); Bethesda 
Cite Hutchison), St. Louis Con Abbott), Missouri. 
This is a fruit-eating form. I have bred it from banana and potato. 
In many places in the Eastern States it is the commonest of the woods 
species. 
The eggs have two filaments. The chromosomes, reported by Metz, 
are described on page 39. 
Drosophila robusta Sturtevant. 1916. Ann. Ent. Soc. America, 9, 331. 
3, 9. Arista with about six branches above and three below. Antenne dark brown, 
second joint pollinose distally. Front over one-third width of head, wider above; dark 
coffee-brown, orbits and triangle slightly grayish pollinose. Second orbital fine, about 
one-fourth length of other two. Second oral bristle not quite one-half size of first. More 
than one prominent bristle on each palpus. Carina broad, very slightly sulcate; face 
somewhat shining, brown. Cheeks brown, their greatest width scarcely one-sixth greatest 
diameter of eyes. Eyes with short pile. 
Acrostichal hairs somewhat irregular, in six to eight rows; no prescutellars. Mesonotum 
dark dull-brown, with four faint pollinose longitudinal stripes. Scutellum and pleure 
dark dull-brown. Legs pale brown; first coxe blackish brown beneath, with a whitish 
pollinose spot between them. Apical and preapical bristles on first and second tibia, pre- 
apicals on third. 
Abdomen grayish brown, each segment with a very broad dark-brown fascia on each 
side; these fascie often nearly or quite meet in the mid-dorsal line. 
Wings clear, veins brown, subterminal part of first vein very dark. Costal index about 
4.0; fourth-vein index about 1.6; 52 index about 1.2; 4c index about 0.7. 
Length of body 2.5 mm.; wing 2.7 mm. 
Specimens examined: Hanover, New Hampshire; Woods Hole, Massa- 
echusetts; Ithaca (S. W. Frost), Cold Spring Harbor (C. W. Metz), Staten 
Island (F. Schrader), New York; Cabin John Bridge, Maryland (R. C. 
Shannon); Falls Church, Virginia (N. Banks); Kushla, Alabama (type 
material); Helena, Arkansas (H. S. Barber). 
This species is a fruit eater. I have bred it from banana, tomato, and 
potato. Nearly four weeks are required for its development. 
The eggs have four filaments. The chromosomes, reported by Metz 
(1916, Amer. Nat., 50), are described on page 39; the mating habits will 
be found on page 7. The puparium has long anterior spiracles, and super- 
ficially resembles that of D. ammigrans n. sp. on that account. The head 
is figured on page 25 (fig. 6). 
Drosophila sulcata Sturtevant. 1916. Ann. Ent. Soc. America, 9, 330. 
o', @. Arista with about five branches above and two below. Antenne reddish brown, 
third joint dark. Front over one-third width of head; reddish brown, with a dark-brown 
ocellar dot. Second orbital about one-fourth other two. Second oral bristle not quite 
one-half first. Three large bristles on each palpus. Carina prominent, not very broad, 
distinctly sulcate; face reddish brown. Cheeks reddish brown; their greatest width about 
one-fifth greatest diameter of eyes. Eyes with rather short, sparse pile. 
Acrostichal hairs in six rows; no prescutellar bristles. Mesonotum grayish pollinose, 
with somewhat indefinite and variable reddish-brown interrupted stripes. These markings 
are easily obscured in imperfect specimens. Scutellum grayish pollinose. Pleure grayish 
pollinose, reddish-brown below. Legs, including cox, pale reddish-brown. Apical and 
preapical bristles on first and second tibiz, preapicals on third. 
Abdomen grayish, with a dark-brown fascia on each side of each segment, leaving 
usually only a median dorsal and a posterior gray line. 
